Math Problem Statement

Using the Binet’s Formula:

What is the 35th term of the Fibonacci Sequence?

Responses

A 8,965,4878,965,487

B 317,811317,811

C 9,227,4659,227,465

D 604,419

Solution

To find the 35th term of the Fibonacci sequence using Binet's Formula, we use the following equation:

F(n)=(1+52)n(152)n5F(n) = \frac{ \left( \frac{1 + \sqrt{5}}{2} \right)^n - \left( \frac{1 - \sqrt{5}}{2} \right)^n }{\sqrt{5}}

Where:

  • F(n)F(n) is the nth Fibonacci number,
  • nn is the position in the sequence (in this case, n=35n = 35).

Let’s calculate the 35th term using this formula. I'll simplify the terms and compute the result.

F(35)=(1+52)35(152)355F(35) = \frac{ \left( \frac{1 + \sqrt{5}}{2} \right)^{35} - \left( \frac{1 - \sqrt{5}}{2} \right)^{35} }{\sqrt{5}}

Approximate calculation:

  1. 1+521.618\frac{1 + \sqrt{5}}{2} \approx 1.618
  2. 1520.618\frac{1 - \sqrt{5}}{2} \approx -0.618

Now, using these values and computing:

F(35)1.61835(0.618)355F(35) \approx \frac{1.618^{35} - (-0.618)^{35}}{\sqrt{5}}

Let me compute the value.The 35th term of the Fibonacci sequence is approximately 9,227,4659,227,465.

Thus, the correct response is C.

Would you like more details on how this was calculated, or do you have any questions?

Here are 5 related questions to consider:

  1. How does Binet's formula approximate Fibonacci numbers?
  2. What is the significance of the golden ratio ϕ\phi in Fibonacci calculations?
  3. Can you use Binet’s formula for any position in the Fibonacci sequence?
  4. How do rounding errors affect the precision of Binet's formula for large nn?
  5. What are other methods to calculate large Fibonacci numbers besides Binet's formula?

Tip: Binet's formula is an approximation, but it becomes highly accurate for larger nn because the negative term ψn\psi^n approaches 0.

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Math Problem Analysis

Mathematical Concepts

Fibonacci Sequence
Golden Ratio
Algebra

Formulas

Binet’s Formula: F(n) = [(1 + √5)/2]^n - [(1 - √5)/2]^n) / √5

Theorems

Binet’s Theorem
Golden Ratio

Suitable Grade Level

Grades 9-12